Upper and lower critical magnetic fields of superconducting NdFeAsO 1-xFx single crystals studied by Hall-probe magnetization and specific heat

Z. Pribulova; T. Klein; J. Kacmarcik; C. Marcenat; M. Konczykowski; S. L. Bud'ko; M. Tillman; P. C. Canfield

doi:10.1103/PhysRevB.79.020508

Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat

Z. Pribulova
, T. Klein
, J. Kacmarcik
, C. Marcenat
, M. Konczykowski
, S. L. Bud'ko
, M. Tillman
, P. C. Canfield

École Polytechnique

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (T_c∼32-35-K). The anisotropy of the penetration depth (Γ_λ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γ_ξ∼5.5±1.5 close to T _c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).

langue originale	Anglais
Numéro d'article	020508
journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Numéro de publication	2
Les DOIs	https://doi.org/10.1103/PhysRevB.79.020508
état	Publié - 5 janv. 2009

Accès au document

10.1103/PhysRevB.79.020508

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Contient cette citation

Pribulova, Z., Klein, T., Kacmarcik, J., Marcenat, C., Konczykowski, M., Bud'ko, S. L., Tillman, M., & Canfield, P. C. (2009). Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat. Physical Review B - Condensed Matter and Materials Physics, 79(2), Article 020508. https://doi.org/10.1103/PhysRevB.79.020508

@article{7543506ffb1b463d8a5b45c9ada4fd85,

title = "Upper and lower critical magnetic fields of superconducting NdFeAsO 1-xFx single crystals studied by Hall-probe magnetization and specific heat",

abstract = "The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (Tc∼32-35-K). The anisotropy of the penetration depth (Γλ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γξ∼5.5±1.5 close to T c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).",

author = "Z. Pribulova and T. Klein and J. Kacmarcik and C. Marcenat and M. Konczykowski and Bud'ko, \{S. L.\} and M. Tillman and Canfield, \{P. C.\}",

year = "2009",

month = jan,

day = "5",

doi = "10.1103/PhysRevB.79.020508",

language = "English",

volume = "79",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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number = "2",

}

Pribulova, Z, Klein, T, Kacmarcik, J, Marcenat, C, Konczykowski, M, Bud'ko, SL, Tillman, M & Canfield, PC 2009, 'Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat', Physical Review B - Condensed Matter and Materials Physics, VOL. 79, Numéro 2, 020508. https://doi.org/10.1103/PhysRevB.79.020508

Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat. / Pribulova, Z.; Klein, T.; Kacmarcik, J. et al.
Dans: Physical Review B - Condensed Matter and Materials Physics, Vol 79, Numéro 2, 020508, 05.01.2009.

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

TY - JOUR

T1 - Upper and lower critical magnetic fields of superconducting NdFeAsO 1-xFx single crystals studied by Hall-probe magnetization and specific heat

AU - Pribulova, Z.

AU - Klein, T.

AU - Kacmarcik, J.

AU - Marcenat, C.

AU - Konczykowski, M.

AU - Bud'ko, S. L.

AU - Tillman, M.

AU - Canfield, P. C.

PY - 2009/1/5

Y1 - 2009/1/5

N2 - The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (Tc∼32-35-K). The anisotropy of the penetration depth (Γλ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γξ∼5.5±1.5 close to T c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).

AB - The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (Tc∼32-35-K). The anisotropy of the penetration depth (Γλ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γξ∼5.5±1.5 close to T c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).

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